Teach You a Lesson, Study Group, and Weak Hero are among the most popular K-dramas right now. Here's why these school action series feel so similar and why fans around the world can't stop watching them.

Weak Hero Class Season 3 speculation rises again one year after Season 2 as Choi Hyun Wook shares a selfie with Park Ji Hoon and Choi Minyeong hints the cast is passionate about returning.